Development tools for Zephyr on STM32Workbench for Zephyr: VS Code extension to set up, build, flash and debug Zephyr applications on STM32.Devicetree manager: browse, edit and visualize Zephyr devicetree, STM32CubeMX-like for Zephyr.
Can you at least send us the full linker script and the full part number of your mcu (the letters and digits after STM32L476, which give in particular the memory size of the mcu) ?